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[45.62.117.175]) by smtp.gmail.com with ESMTPSA id 956f58d0204a3-6443f2abde8sm264191d50.3.2025.12.03.20.34.40 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Wed, 03 Dec 2025 20:34:46 -0800 (PST) From: Shuran Liu To: song@kernel.org Cc: andrii@kernel.org, ast@kernel.org, bpf@vger.kernel.org, daniel@iogearbox.net, dxu@dxuuu.xyz, eddyz87@gmail.com, electronlsr@gmail.com, ftyg@live.com, gplhust955@gmail.com, haoluo@google.com, haoran.ni.cs@gmail.com, john.fastabend@gmail.com, jolsa@kernel.org, kpsingh@kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-trace-kernel@vger.kernel.org, martin.lau@linux.dev, mathieu.desnoyers@efficios.com, mattbobrowski@google.com, mhiramat@kernel.org, rostedt@goodmis.org, sdf@fomichev.me, shuah@kernel.org, yonghong.song@linux.dev Subject: Re: [PATCH bpf v3 2/2] selftests/bpf: fix and consolidate d_path LSM regression test Date: Thu, 4 Dec 2025 12:34:22 +0800 Message-ID: <20251204043424.7512-1-electronlsr@gmail.com> X-Mailer: git-send-email 2.50.1 In-Reply-To: References: Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Hi Song, Thanks for the review. > I don't get why we add this selftest here. It doesn't appear to be related to > patch 1/2. The regression that patch 1/2 fixes was originally hit by an LSM program calling bpf_d_path() from the bprm_check_security hook. The new subtest is a minimal reproducer for that scenario: without patch 1/2 the string comparison never matches due to verifier's faulty optimization, and with patch 1/2 it behaves correctly. > The paragraph above is not really necessary. Just curious, did some AI > write it? The paragraph was indeed generated with the help of an AI assistant, and I didn’t trim it down enough. I’ll drop it and keep the changelog focused and brief in v4. > This {} block is not necessary. I’ll remove that extra block in v4. Thanks again for the feedback. Best regards, Shuran Liu